- Veeam Support Knowledge Base
- Advanced transport modes (HotAdd and SAN) fail over to NBD mode
Advanced transport modes (HotAdd and SAN) fail over to NBD mode
| KB ID: | 3204 |
| Product: |
Veeam Backup & Replication Veeam Cloud Connect |
| Version: | 9.5 and higher |
| Published: | 2020-06-09 |
| Last Modified: | 2020-08-13 |
Get weekly article updates
By subscribing, you are agreeing to have your personal information managed in accordance with the terms of Veeam's Privacy Notice.
Cheers for trusting us with the spot in your mailbox!
Now you’re less likely to miss what’s been brewing in our knowledge base with this weekly digest
Challenge
Advanced transport modes (Virtual Appliance (HotAdd) or Direct Storage access) may not work, failing over to the NBD transport mode instead.
If you are seeing error "Cannot use advanced transport modes, failing over to NBD" you should check the HotAdd attacher agent log (default location - C:\ProgramData\Veeam\Backup\Job_name\Agent.Job_name.VM_name.Hotadd.Attacher.log) on affected backup proxy/proxies, you may encounter following “SSL exception” error:
If you are seeing error "Cannot use advanced transport modes, failing over to NBD" you should check the HotAdd attacher agent log (default location - C:\ProgramData\Veeam\Backup\Job_name\Agent.Job_name.VM_name.Hotadd.Attacher.log) on affected backup proxy/proxies, you may encounter following “SSL exception” error:
[08.04.2020 8:26:46.680] < 724> vdl| [vddk] 2020-04-08T20:26:46.680-07:00 error -[00724] [Originator@6876 sub=Default] SSL Async Handshake Timeout : Read timeout after approximately 25000ms. Closing stream <SSL(<io_obj p:0x000001ef0b15eb68, h:1100, <TCP 'x.x.x.x : 49746'>, <TCP 'x.x.x.x : 443'>>)> [08.04.2020 8:26:51.668] < 5412> vdl| [vddk] 2020-04-08T20:26:51.668-07:00 error -[05412] [Originator@6876 sub=IO] HandshakeCb; <SSL(<io_obj p:0x000001ef0b15eb68, h:-1, <TCP 'x.x.x.x : 49746'>, <TCP 'x.x.x.x : 443'> FD Closed>)>; error: class Vmacore::Ssl::SSLHandshakeTimeoutException(SSL Exception: The file handle supplied is not valid)
Cause
The SSL certificate and thumbprint verification is a mandatory process starting from VMware VDDK 6.0. Advanced transport modes (Virtual Appliance (HotAdd) or Direct Storage access) are utilizing TLS protocol unlike the NBD mode.
Solution
If your vCenter has a self-signed certificate tree, install all certificates on all proxies.
https://kb.vmware.com/s/article/2108294
https://kb.vmware.com/s/article/2108294
To submit feedback regarding this article, please click this link: Send Article Feedback
To report a typo on this page, highlight the typo with your mouse and press CTRL + Enter.
To report a typo on this page, highlight the typo with your mouse and press CTRL + Enter.
Spelling error in text
Thank you!
Your feedback has been received and will be reviewed.
Oops! Something went wrong.
Please try again later.
KB Feedback/Suggestion
This form is only for KB Feedback/Suggestions, if you need help with the software open a support case
Verify your email to continue your product download
We've sent a verification code to:
An email with a verification code was just sent to
Didn't receive the code? Click to resend in sec
Didn't receive the code? Click to resend
Start using Veeam:
Download the product
&
Activate the license key
Thank you!
Your feedback has been received and will be reviewed.